According to an aspect, a detection device includes: a substrate having a plurality of divided areas; a plurality of photodiodes that are provided on the substrate, and in each of which a lower electrode, an active layer, and an upper electrode are stacked in the order as listed; and a plurality of sealing films that cover the photodiodes. Each of the divided areas includes at least one of the photodiodes and one of the sealing films. The one sealing film covers a side wall of the active layer.